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Answer:
As forex ninja has said, there are many human inventions, using techinical analysis, to identify a trend. You can also identify trends by gauging market sentiment, you can also use interest rate expectation to identify a possible trend. A currency with rising interest rate attracts investors in a normal market condition, and that is bullish for the currency. Say if the bank of canada comes out in the next meeting with a decision to raise the interest rate and speaking hawkish, that could spark a buying trend for the canadian dollar that could last for some times. The uptrend could come to an end when traders think the central bank might cease hiking rate, that could be an exit of the rising trend.
